Plastic tanks pop all of the time, they're really a poor replacement for the brass tanks. A lot of the replacement radiators we use have metal tanks instead of the E plastic tanks. I've seen all-metal radiators bow and/or blow out from bad caps not releasing pressure, without harming hoses or gaskets.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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